Oxylakis truncatipennis Bolivar, 1900

Nagar, Rajendra, Swaminathan, Tatiana & Swaminathan, R., 2016, A note on Agraeciini species (Orthoptera: Tettigoniidae: Conocephalinae) in India, Zootaxa 4162 (3), pp. 438-450 : 446-450

Oxylakis truncatipennis Bolivar, 1900

(Plate IV&V; Fig. 16–21)

Material examined. (01 Specimen, 1♂). Paratype: India: Tamil Nadu: 4.vii.1982, Coll. V. V. Belavadi (Valparai).

Description. Fastigium verticis conical, apex obtuse, furrowed above. Frons shining with few impressed dots, genae rugose. Pronotum rugose, anterior margin broadly rounded but faintly subtruncate in middle, posterior margin truncate; anterior-ventral angle obtusely projecting; transverse sulcus faintly indicated on disc. Prosternal spines short. Tegmen surpassing stretched hind legs. Mesocoxa with rounded swelling at ventro-internal margin rather large. Knee lobes of pro- and mesofemur obtuse on both sides; postfemur obtuse on external, obtuse or spinose on internal side.

Male. Stridulatory vein on underside of left tegmina with about 60 teeth per 0.5 mm. Progressively reduced in size and more densely packed from base towards apex.Tenth abdominal tergite with large projection posteriorly, apex broadly, almost straight, slightly widening towards apex with a visible middle carina. Cerci cylindrical at base, posterior apical area subacute slightly inwards; dorso-ventrally compressed; internal marginwith three internal processes like projection in basal area; thereafter widening to a large, rounded, dorsally concave projection until apex; apical margincurved and with a large spine on internal margin. Supra anal plate central area elevated; apex sub truncate (slightly convex) and rounded.Subgenital plate broad, large basal area broader than long, centre of posterior margin rounded in middle. Styli small, cylindrical, apices obtuse. Femora with the following number of spines on ventral margins: fore femur no spine on external, 3-4 internal; mid femur 4 external, 0 internal; hind femur 7 external, 0 internal. Tibial spines on ventral; fore tibia no spine on dorsal margin; 2-2 external, 3-4 internal; one apical spur; mid tibiano spine on dorsal margin;7 external, 0 internal; hind tibia9dorsoexternal, 6 dorsointernal; 6 ventroexternal; 0-1 ventrointernal; 6 apical spurs at all four angles.

Colouration. Generally brown to testaceous. Frons, head and pronotum reddish brown, moderately light but with darker (brown) ring around whitish median ocellus, almost yellowish antennal flagellum having a few small light brown rings in proximal part, yellowish mandibles having blackish medial and distolateral parts, and orange labrum, dorsal part of clypeus, genae brown; ventral part of clypeus and palpi white; palpi pale yellow with some tint of green; mandibles black; labrum, scapus, pedicellus, vertex and occiput light yellow brown; vertex and occiput with some brown venation.Tegmina light brown with rather numerous blackish brown dots, yellowish basal and basomedial parts of dorsal field, and rather large dark brown spot on stridulatory apparatus; hind wings, legs, abdomen and rest of thorax yellowish with light brown femora and tibiae of fore and middle legs, areas on dorsal surface of all tarsi.

Depositories. The specimens are deposited in the Reference Chamber of the Insect Museum (Kushwaha Keet Sangrahalaya), Department of Entomology, Rajasthan College of Agriculture, Maharana Pratap University of Agriculture and Technology, Udaipur, Rajasthan, and Gandhi Krishi Vigyan Kendra, University of Agricultural Sciences, Bangalore, Karnataka, India .

PLATE VI. Oxylakis truncatipennis Bolívar, 1900 male 1–7: 1. Lateral view; 2. Dorsal view of head; 3. Dorsal view of pronotum; 4. Lateral view of head and pronotum; 5. Frontal view; 6. Ocelli on frons; 7. Sternum.

PLATE V. O. truncatipennis male 8–14: 8. Left tegmina; 9. Lateral view of mid femur; 10. Lateral view of hind femur; 11. Lateral view of fore tibia; 12. Ventral view of subgenital plate; 13. Dorsal view of tenth abdominal tergite with cerci; 14. Ventral view of left cerci.

Measurement (mm) P. brunnea G. pulcher O. truncatipennis